We requested a late check out when we stayed at ASMo's in May because our flight did not leave until 930 pm, I went to the front desk the day before we checked out and we were given until 1, I then asked if we could stay until 3 and that we were willing to pay, we ended up paying for a half of a nights stay which I thought was pretty steep but in the end we really thought the couple of extra hours were well worth it.